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<?php $a = [1, 2, 3, 4, 3, 2, 1]; $j = count($a) - 1; $output = []; for($i = 0; $i > count($a); $i++) { echo 'ddd' . $a[$i] ." ". $a[$j]; if ($a[$i] !== $a[$j]) { $output = $a[$i]; } $j--; } print_r($output);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( )

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129.94 ms | 402 KiB | 117 Q